Phase-periodic proximity-effect compensation in symmetric normal/superconducting mesoscopic structures
V. T. Petrashov, R. Sh. Shaikhaidarov, I. A. Sosnin, P. Delsing, T. Claeson, A. Volkov
DOI 10.1103/PhysRevB.58.15088 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
The conductance (G) of mirror-symmetric, disordered normal (N) metal mesoscopic structures with two interfaces to superconductors (S) has been studied experimentally with applied condensate phase differences Δφ between the N/S interfaces. At Δφ=2nπ(n=0,1,2,3,…) the conductance showed reentrance to the normal state below the temperature corresponding to the Thouless energy. The current-voltage characteristics were found to be strongly nonlinear even at distances between the N/S interfaces largely exceeding the normal-metal coherence length. An influence of superconductors almost completely disappeared at Δφ=(2n+1)π where the structures showed normal behavior. Calculations based on a quasiclassical theory have been performed offering a quantitative explanation of such a phase-periodic reentrance. The value of the superconducting gap Δeff at the Ag/Al interface has been obtained. We find that Δeff(T,V→0)=β⋅ΔBCS(T) with β=0.2 independent of temperature in the temperature interval of 0.1K<T<1.6K; ΔBCS(T) is the BCS gap vs T function in Al.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.4 | Pressure not reported | onset |
Similar papers
Mesoscopic ferromagnet-superconductor junctions and the proximity effect
similarity 0.97J. Aumentado & V. Chandrasekhar
Source status unknown — claims are unverified
Anomalous proximity effect in mesoscopic normal-metal–superconductor structures
similarity 0.97V. N. Antonov et al.
Source status unknown — claims are unverified
Superconducting proximity effect in a mesoscopic ferromagnetic wire
similarity 0.96M. Giroud et al.
Source status unknown — claims are unverified
Long-Range Coherence in a Mesoscopic Metal near a Superconducting Interface
similarity 0.96H. Courtois et al.
Source status unknown — claims are unverified
Reentrance of the Metallic Conductance in a Mesoscopic Proximity Superconductor
similarity 0.96P. Charlat et al.
Source status unknown — claims are unverified
Giant Mutual Proximity Effects in Ferromagnetic/Superconducting Nanostructures
similarity 0.96V. T. Petrashov et al.
Source status unknown — claims are unverified